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    <title>计科2412尤佳清28</title>
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        * { 
            margin: 0; 
            padding: 0; 
            box-sizing: border-box; 
        }
        .header {
            background: #ccc;
            padding: 20px;
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        .header a {
            float: right;
            margin-left: 20px;
            color: #000;
            text-decoration: underline;
        }
        .header a:hover {
            color: #000;
            text-decoration: underline;
        }
        .content {
            overflow: hidden;
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        .main {
            background: #c7e6f5;
            width: 70%;
            height: 300px;
            float: left;
            padding: 10px;
        }
        .sidebar {
            background: #f9c5d5;
            width: 30%;
            height: 300px;
            float: left;
            padding: 10px;
        }
        .footer {
            background: #ccc;
            padding: 20px;
            clear: both;
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<body>
    <div class="header">
        信息技术工程学院
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        <a href="#">课程查看</a>
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    <div class="content">
        <div class="main">内容</div>
        <div class="sidebar">侧边栏</div>
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    <div class="footer">copyright...</div>
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